A substance which has a face centered cubic crystal has a density of 1.984 gcm$^{-3}$ and the edge length of the unit cell equal to 630 ppm. What is the molar mass of the substance?

Question

$\begin{array}{1 1} 37.35\; g\;mol^{-1} \\ 56.02\; g\;mol^{-1} \\ 65.36\; g\;mol^{-1} \\ 74.7\; g\;mol^{-1}\end{array}$